L X-ray production cross-section ratios for protons incident on high-Z atoms: A test of ECPSSR theory and newly recommended vacancy de-excitation parameters
✍ Scribed by B.N. Jones; J.L. Campbell
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 185 KB
- Volume
- 258
- Category
- Article
- ISSN
- 0168-583X
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✦ Synopsis
The X-ray intensity ratios Lb/La and Lc/La for six heavy elements have been measured using a Si(Li) detector coupled to both analog and digital signal processors. The proton energies were chosen to ensure that possible united atom (UA) and intra-shell (IS) effects would be small, thereby ensuring that the experiments were a direct test of the ECPSSR together with the L subshell fluorescence and Coster-Kronig probabilities. Careful attention was paid to reducing recognized uncertainties in the fitting of the spectra, with the desired intensity ratios being extracted from a procedure that assumed the DF radiative transition rates of Scofield to be correct. Experiment and ECPSSR theory agree closely when the fluorescence and CK probabilities from a recent critical review are adopted in preference to those commonly used in earlier work. This result provides a significant improvement in the database used for PIXE analysis, and it paves the way for more definitive studies at lower proton energies, aimed at testing predicted UA and IS corrections.